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That's the homepafe for the app called Mactracker. It will tell you the specs of almost every mac. And I suggest to use the same type of ram that it says is for your machine. But you don't have to buy it from apple. Anyone you trust is ok.

I noticed the PCI slots on my Mac are empty, do those have any effect on performance?
Or is there any other possible way I can optimize the other memory, such as the cache (which is currently 512kb) or bus speed (which is currently 667mHz)